Dan,
I just finished turning 22 bowls from green juniper (Colorado Cedar). They range in size from 8" to 16". 5 have cracks, (but they will be saleable) the rest are going to be ok. I've turned a lot of cedar and it works fine if you cut the bowl in one session and keep your walls thin and even all the way through ... including the bottom. You don't want to leave it on the lathe ... period. Turn it, sand it and put a finish on it.
The only finish I've found to work well on cedar is lacquer. I use rattle cans ... and apply 2 coats of sanding sealer ... sand between coats... and finish it with 3 or 4 coats of gloss lacquer. Oil finishes create nothing but problems over thelong haul with cedar.
You can sand it down pretty good on the lathe, but you'll still get some trouble spots you can't sand out. I've found I can usually clean those up with a few minutes of hand sanding with the grain.
That's my story and I'm sticking to it. Good luck ... you should get some fabulous end results.